<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
      <!-- 步骤条 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader v-model="addForm.goods_cat" :options="catelist" :props="{ expandTrigger: 'hover',label:'cat_name',value:'cat_id',children:'children'}" @change="handleChange">
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!-- action表示图片要上传到的后台api接口 -->
            <el-upload
              :action="uploadURL" :headers="headerObj" :on-success="handleSuccess"
              :on-preview="handlePreview" :on-remove="handleRemove"  list-type="picture">
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品的按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'
export default {
  data(){
    return {
      activeIndex:'0',
      // 添加商品的表单数据对象
      addForm:{
        goods_name:'',
        goods_price:0,
        goods_weight:0,
        goods_number:0,
        // 商品所属的分类数组
        goods_cat:[],
        // 图片的数组
        pics:[],
        // 商品的详情描述
        goods_introduce:'',
        attrs:[]
      },
      // 商品分类列表
      catelist:[],
      // 动态参数列表数据
      manyTableData:[],
      //静态属性列表数据
      onlyTableData:[],
      // 验证规则
      cateProps:{
        label:'cat_name',
        value:'cat_id',
        children:'children'
      },
      //表单的验证规则
      addFormRules:{
        goods_name:[
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price:[
          { required: true, message: '请输入商品价格', trigger: 'blur' },
        ],
        goods_weight:[
          { required: true, message: '请输入商品重量', trigger: 'blur' },
        ],
        goods_number:[
          { required: true, message: '请输入商品数量', trigger: 'blur' },
        ],
        goods_cat:[
          { required: true, message: '请选择商品分类', trigger: 'blur' },
        ]
      },
      // 上传图片的URL地址
      uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
      //图片上传组件的headers请求头对象
      headerObj:{
        Authorization:window.sessionStorage.getItem('token')
      },
      // 预览图片
      previewPath:'',
      // 隐藏图片预览对话框
      previewVisible:false
    }
  },
  created(){
    this.getCateList()
  },
  methods:{
    //获取所有商品分类数据
    async getCateList(){
      const {data:res}=await this.$http.get('categories')
      if (res.meta.status !==200) {
        return this.$message.error('获取商品分类数据失败！')
      }
      this.catelist=res.data
      console.log(res);
    },
    // 级联选择器选中项变化，会触发这个函数
    handleChange(){
      console.log(this.addForm.goods_cat);
      if (this.addForm.goods_cat.length !==3) {
        this.addForm.goods_cat=[]
      }
    },
    //
    beforeTabLeave(activeName,oldactiveName){
      // console.log('即将离开的标签页的名字是'+oldactiveName);
      // console.log('即将进入的标签页的名字是'+activeName);
      // return false
      if (oldactiveName==='0' && this.addForm.goods_cat.length !==3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },

    async tabClicked(){
      // console.log(this.activeIndex);
      // 证明访问的是动态参数面板
      if (this.activeIndex === '1') {
        const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
        if (res.meta.status !==200) {
          return this.$message.error('获取动态参数失败！')
        }
        console.log(res.data);
        res.data.forEach(item=>{
          item.attr_vals=item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData=res.data
      }else if(this.activeIndex ==='2'){
        const{data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
        if (res.meta.status !==200) {
          return this.$message.error('获取静态属性失败！')          
        }
        console.log(res.data);
        this.onlyTableData=res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file){
      console.log(file);
      this.previewPath=file.response.data.url
      this.previewVisible=true

    },
    //处理移除图片的操作
    handleRemove(file){
      console.log(file);
      //1.获取将要删除的图片的临时路径
      const filePath=file.response.data.tmp_path
      // 2.从pics数组中，找到图片对应的索引值
      const i=this.addForm.pics.findIndex(x =>x.pic ===filePath)
      // 3.调用数组splice方法，把图片信息对象，从pics数组中移除
      this.addForm.pics.splice(i,1)
      console.log(this.addForm);
    },
    // 监听图片上传成功的事件
    handleSuccess(response){
      console.log(response);
      // 1.拼接得到一个图片信息对象
      const picInfo={pic:response.data.tmp_path}
      //2.将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm);
    },
    // 添加商品
    add(){
      console.log(this.addForm.goods_introduce);
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项!')
        }
        //执行添加的业务逻辑
        //lodash cloneDeep(obj) 级联选择器要求是数组，此处要求是字符串，此处需要深拷贝一份，独立与原对象
        const form = _.cloneDeep(this.addForm)
        form.goods_cat=form.goods_cat.join(',')
        //处理动态参数
        this.manyTableData.forEach(item=>{
          const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
          this.addForm.attrs.push(newInfo)
        })
        //处理静态属性
        this.onlyTableData.forEach(item=>{
          const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals}
          this.addForm.attrs.push(newInfo)
        })
        form.attrs=this.addForm.attrs
        console.log(form);
        //发起请求添加商品
        // 商品的名称必须是唯一的
        const {data:res} = await this.$http.post('goods',form)
        if (res.meta.status !==201) {
          return this.$message.error('添加商品失败！')
        }
        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
  },
  computed:{
    cateId(){
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>
<style lang="less" scoped>
.el-checkbox{
  margin: 0 10px 0 0 !important;
}
.previewImg{
  width: 100%;
}
.btnAdd{
  margin-top: 15px;
}
</style>